Bttdolf rodeewaxd



May 30, 1933. R. ROD ERWALD 1,911,532

I PROCESS OF MANUFACTURING ENDLESS V-BELTS Filed Dec. 6, 1930 INVENTOR A TTOR/VE V5.

Patented m ad, 1933 I UNITED STATES PATENT OFFICE BUDOLF BODEBWALI), OF BERLIN, GERMANY, ASSIGNOR TO THE DAYTON RODEBWALD COMPANY, OF DAYTONL OHIO, A COZRIPORATION OF OHIO PROCESS OF MANUFACTURING ENDLESS V-BELTS Application tilled.v Decemb'er fi, 1980, Serial No.

My invention relates to a process of manufacturing an endless full V-belt with proections produced by removing parts of the lt'at se arated. oints.

5 In the nited tates Letters Patent No.

1,701,507 I have proposed a process'of manufacturing V-belts whichconsists in form in the belt throughout its length as a solid fuIl V-belt and then removing parts of the belt at separated tions or teeth.

According to my present invention I proose to use certain constructions of endess solid full V-belts and to provide these belts with the said projections in the. same manner.

.By removin parts of the belt the flexibility of the elt becomes considerably increased. Therefore, when this process of removing parts is employed on a belt, which is built up by parallel layers ofa rubberized fabric or cloth and which possesses a priori ahigh degree of flexibility, an exorbitant flexibility is obtained. Similarly, when this process of removing parts is employed on a belt which is built up by a rubberized fabric points to provide projecrolled on its longitudinal axis and which ossesses a priori a smaller degree of flexiility, likewise a considerably higher degree of the flexibility is obtained.

Therefore, it is an object of my present invention to produce V-belts and especially endless V-belts considerable flexibility and itis a further object of my invention to produce endless belts adapted to run over pulleys with very small diameters, and finally it is an object of my present invention to produce the said belts at very small cost.

In the drawing:

belt built up by parallel layers of a rubberized fabric;

Figure 1a shows a cross section on the line lav-1a of Figure 1; v

Figure 2 is a side view of this belt, when provided with projections separated by recesses made by removing parts;

Figure 3 shows a cross section on the. line- 33 of Figure 2; Figure 4 illustrates a further embodiment Figure 1 is a side view of a solid full V- 500,549, and in Germany November 7, 1980.

of my invention and shows in a reduced scale an-annular-formed piece of rubberized fabric adapted to form an endless belt b rolling the fabric and pressing it afterwar s to trapezoidal form.

In both. embodlments illustrated in the drawinga solid and full V-belt is first produced.

In the embodiment shown in Figures 1, 1a, 2 and 3 the full belt is built up by a pinrality of parallel layers, as clearly shown from the section of Figures 101 and3.

As illustrated in Figure 2 this belt is now provided with projections by removing parts of the belt at separated points on the as smaller or inner side of the endless belt, whereby an endless belt of considerable flexibility is obtained. This belt is adapted to run over the smallest diameters, which occur in practice. The endless belt illustrated in Figure 1 is preferably built up by an endless band wound on a drum with an outer diameter like the inner diameter of the endless belt.

If desired, a layer of pure'rubber may be inserted in the middle part of the belt. By

removing the parts e. g. by stamping, the

cut is laid through the said pure layer of rubber, so that the inner side of the recesses remains covered and protected by the remaining part of the layer. Moreover, the said layer isadapted to resiliently hold the projections on the belt.

According to the otherembodiment of my invention illustrated on Figure 4 the annular-shaped fabric shown in the drawing isrolled'and pressed to trapezoidal form. and then provided with teeth or projections in the same manner as fully described above.

It will be understood that I desire to comprehend within my invention such modifications. as may be necessary to adapt it to varying conditions and uses.

Having thus fully described my invention, what I claim as new and desire to se- 95,

cure by Letters Patent, is:

1. The process of manufacturing an endless full V-belt with projections thereon, characterized in that a full V-belt is built up of a plurality of parallel layers, a layer less belt consisting of the followin of pure rubber bein inserted between the parallel layers 'pre erably in the middle height of the belt, parts being afterward removed on the inner side of the endless belt whereby teeth are formed and the flexibility of the belt is considerably increased.

2. The process of manufacturm an endless belt consisting of formin a It with inner and outer layers of rub erized fabric and an intermediate layer of pure rubber, and forming of the inner layers teeth by cutting parts of the inner layers away.

3. The process ofmanufacturing an endsteps: forming a plurality of endless para lel layers upon each other by windlng an impregnated fabric, inserting a layer of rubber at substantially the middle of said belt durmg the winding operation, subjecting portions of the sides of said belt, as formed by the winding operation to greater ressure than other portions of the sides to orm an endless belt of, trapezoidal cross section and then removing parts of the higher compressed portions of the belt and at least a portion of said rubber layer to form projections.

ture.

RUDOLF RODERWALD.

In testimony whereof, I afiix my signa- 

